header .header_bottom .all_class ul{
  background-color: #555;
  opacity: 0.7;
  display: none;
}
header .header_bottom .all_class h2{
  font-size: 20px;
  background-color: #e05c46;
}
header .header_bottom .nav #home_page{
  border-bottom: none
}
header .header_bottom .nav .prevent_page{
  padding-bottom: 4px;
  border-bottom: 3px solid #fff;
}
header .header_bottom .nav #home_page:hover{
  padding-bottom: 2px;
  border-bottom: 3px solid #fff;
}
header .header_bottom .nav .second_sheet:hover{
  padding-bottom: 4px;
  border-bottom: 3px solid #fff;
}

/* section */
section .bg{
  width: 1920px;
  height: 400px;
  background-image: url(../imgs/bg1.jpg);
  background-size: cover;
}
section .container{
  /*border: 1px solid red;*/
  margin: 40px auto;
}
section .content_top{
  height: 60px;
  text-align: center;
}
section .content_bottom{
  display: flex;
  flex-wrap: wrap;
}
section .content_bottom .box{
  width: 50%;
  height: 300px;
}
section .content_bottom .box .left{
  width: 260px;
  height: 250px;
  float: left;
}
section .content_bottom .box .right{
  width: 340px;
  height: 250px;
  float: left;
}
section .content_bottom .box .right h3{
  margin: 20px 16px;
}
section .content_bottom .box .right p{
  margin: 0 16px 0 ;
  font-size: 15px;
}
section .our_advantage{
  width: 100%;
  height: 438px;
}
section .our_advantage h2{
  text-align: center;
  margin: 40px 0;
}
section .our_advantage .left{
  width: 50%;
  float: left;
}
section .our_advantage .left img{
  width: 100%;
  height: 360px;
}
section .our_advantage .right{
  width: 50%;
  height: 360px;
  float: right;
}
section .our_advantage .right>div{
  height: 106px;
  margin: 0 10px;
  border-bottom: 1px solid #999;
}
section .our_advantage .right>div h3{
  margin: 10px 0 10px 16px;
}
section .our_advantage .right>div p{
  margin: 10px 10px 10px 16px;
  font-size: 15px;
}
section .cases h2{
  text-align: center;
  margin: 40px 0;
}
section .cases .case1{
  width: 100%;
  height: 300px;
  margin: 60px 0;
  display: flex;
}
section .cases .case2{
  width: 100%;
  height: 300px;
  margin: 60px 0;
  display: flex;
}
section .cases .case3{
  width: 100%;
  height: 300px;
  margin: 60px 0;
  display: flex;
}
section .cases .left{
  width: 40%;
  height: 300px;
}
section .cases .left h3{
  text-align: center;
  margin: 0;
  height:54px;
  font-size: 24px;
  line-height: 80px;
}
section .cases .left h5{
  text-align: center;
  font-size: 16px;
  color: #999;
  font-weight: normal;
  margin: 10px 0;
}
section .cases .left p{
  margin: 40px 20px;
}
section .cases .right{
  width: 60%;
  height: 300px;
}
section .cases .right .top{
  width: 100%;
  height: 230px;
  padding-top: 30px;
}
section .cases .right .top .top_box{
  width: 100%;
  height: 200px;
  position: relative;
}
section .cases .right .top .pic_prev{
  width: 300px;
  height: 200px;
  position: absolute;
  top: 0;
  left: 0;
}
section .cases .right .top .pic_current{
  width: 420px;
  height: 280px;
  position: absolute;
  top: -30px;
  left: 150px;
  z-index: 5;
}
section .cases .right .top .pic_next{
  width: 300px;
  height: 200px;
  position: absolute;
  top: 0;
  left: 420px;
}
section .cases .right .top .top_box_pic img{
  width: 100%;
  height: 100%;
}
section .cases .right .bottom{
  width: 100%;
  height: 60px;
  background-image: url(../imgs/art_serve/yy.png);
  background-size: 360px;
  background-position: top center;
  background-repeat: no-repeat;
}
section .lxmnpc{
  width: 100%;
}
section .lxmnpc img{
  width: 100%;
}
section .pclogo{
  width: 100%;
}
section .pclogo h2{
  margin: 40px 0;
  text-align: center;
}
section .pclogo img{
  width: 100%;
}
